<html><head>
  <title>Case sensitivity</title>
  <style type="text/css">
 .cs { color: green; }
 .cs P { background: red; color: yellow; }
 .cs .a { background: red; color: yellow; }
 .cs .span1 span { background: red; color: yellow; }
 .cs .span2 { color: red; }
 .cs .span2 SPAN { color: green; }
 .cs .span2 span { background: red; color: yellow; }
 .ci { color: red; }
 .ci P { background: green; color: white; }
 .ci .a { background: green; color: white; }
 .ci .span1 span { background: green; color: white; }
 .ci .span2 SPAN { background: green; color: white; }
</style>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch">
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"> <!-- bogus link to make sure it gets found -->
  <meta name="flags" content="">
 </head>
 <body>
<div>

 <div class="cs">
   <p>This line should be green.</p>
   <p class="A">This line should be green.</p>
   <p class="span1"><span>This line should be green.</span></p>
   <p class="span2"><span>This line should be green.</span></p>
 </div>


</div>

</body></html>